package chapter03;

 class Student1 {
    String name;
    void  read(){
        System.out.println("大家好,我是"+name);
    }
}
class Example01 {
    public static void main (String[] args){
        Student stu1 = new Student();
        Student stu2 = new Student();
        stu1.name = "小明";
        stu1.read();
        stu2.name = "小华";
        stu2.read();
    }
}
 +21 src/chapter03/Example02.java  0 -> 100644
package chapter03;

class Student2{
    String name;
    int age;
    void read() {
        System.out.println("大家好,我是"+name+",年龄"+age);
    }
}
class Example02{
    public static void main(String[] args) {
        Student stu1 = new Student();
        Student stu2 = null;
        stu2 = stu1;
        stu1.name = "小明";
        stu1.age = 20;
        stu2.age = 50;
        stu1.read();
        stu2.read();
    }
}